Antenna apparatus
First Claim
1. An antenna apparatus, comprising:
- a dipole antenna including a first radiation element and a second radiation element, each having a quarter wavelength of a first frequency;
a high-frequency circuit for conducting communications of a high frequency signal;
a ground portion corresponding to the high-frequency circuit;
a signal conductor which connects the dipole antenna to the high-frequency circuit and the ground portion, the signal conductor having a length where the sum total of the length of the first radiation element and the length of the signal conductor, and the sum total of the length of the second radiation element and the length of the signal conductor become a quarter wavelength of a second frequency, respectively;
a first switch for blocking passage of a signal of the first frequency and allowing passage of a signal of the second frequency; and
a second switch for allowing passage of the signal of the first frequency and blocking passage of the signal of the second frequency.
1 Assignment
0 Petitions
Accused Products
Abstract
An antenna apparatus that can be miniaturized without causing inference caused by antenna currents to be occurred if the high band of a dual band wireless system is close to the band of another wireless system in a wireless communication apparatus incorporating the dual band wireless system and another wireless system is provided. A first switch 5 blocks passage of a signal of a high band (first frequency) and allows passage of a signal of a low band (second frequency). A second switch 6 blocks passage of a signal of the low band (second frequency) and allows passage of a signal of the high band (first frequency). Accordingly, the antenna apparatus operates as a dipole antenna with no antenna current flowing into a feeder line at the first frequency and operates as a monopole antenna wherein a radiation element and a feeder line making up the dipole antenna becomes a radiation element at the second frequency lower than the first frequency.
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Citations
25 Claims
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1. An antenna apparatus, comprising:
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a dipole antenna including a first radiation element and a second radiation element, each having a quarter wavelength of a first frequency; a high-frequency circuit for conducting communications of a high frequency signal; a ground portion corresponding to the high-frequency circuit; a signal conductor which connects the dipole antenna to the high-frequency circuit and the ground portion, the signal conductor having a length where the sum total of the length of the first radiation element and the length of the signal conductor, and the sum total of the length of the second radiation element and the length of the signal conductor become a quarter wavelength of a second frequency, respectively; a first switch for blocking passage of a signal of the first frequency and allowing passage of a signal of the second frequency; and a second switch for allowing passage of the signal of the first frequency and blocking passage of the signal of the second frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An antenna apparatus, comprising:
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a first dipole antenna; a second dipole antenna; a board formed with a conductor pattern, the board having a board face and one side-end intersecting with the board face; first and second feeder lines which connect the conductor pattern on a side of the one side-end of the board to feeding points of the first and second dipole antennas, respectively; a first radiation element joined to the feeding point of the first dipole antenna; and a second radiation element joined to the feeding point of the second dipole antenna, wherein the feeding points of the first and second dipole antennas are disposed on the same plane in which the board face is outwardly extended from the one side-end of the board, wherein the first and second radiation elements are disposed in respective perpendicular planes orthogonal to both the board face and the one side-end of the board, and are placed facing each other so that mutual axial directions of the first and second radiation elements are orthogonal to each, other, and wherein the axis of the first radiation element is placed so as to be inclined at an angle larger than 0 degrees and smaller than 90 degrees with respect to a line parallel to the board face and orthogonal to the one side-end of the board. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification